Fluid testing device for plungers and barrels



April 26, 1949- T. H. DWYER ET AL 2,468,050

FLUID TESTING DEVICE FOR'PLUNGERS AND BARRELS Filed March 26, 1946 IN VEN TORS THEODOAE H Dwyz/z y WILLIAM H. D/LD/NE ATTORNEY UNITED suresATENT OFFICE FLUID TESTING DEVICE FOR PLUNGERS AND BARRELS Theodore H.Dwyer and William H. Dildine, United States Navy Application March 26,1946, Serial No. 657,313

2 Claims. (01. 73-40) (Granted under the act of March 3, 1883, asamended April 30, 1928; 370 0. G. 757) l 2 This invention relates to atesting de c and pressure-fluid storage tank I2. Another length morespecifically to an apparatus for testing the of high-pressure tubing 20connects the threecondition of the lapped fit between a hydraulic wayrotary valve l9to the barrel 25, which is to plunger and barrel. betested. By means of suitable fittings a pres- The present method oftesting hydraulic plungsure gauge 22 is connected to the upper frame ersand barrels is by installing them in the device member 23 of theholding. and positioning fixture of which they are a part and thenapplying a l3. A cutoff valve Z i is set between the connectest, ifpossible. tion of the high-pressure tubing and the pres- This method hasbeen found to be cumbersome sure gauge 22. A small hole 25 in the upperand consumptive or much time. The present in- H frame 23 permits thepassage of fluid from the vention makes it possible to test a Wide rangeof high-pressure tubing 20 to the barre1 2|. The

hydraulic plunger and barrel sizes and types acupper end of the barrel2! bears against a soft curately and with a substantial saving in timefibre gasket 25 set in a recess in the upper frame consumed as comparedwith the present practice. 23. A pair of studs 21 rigidly secured inthe.

It is an object of this invention to provide a 15 upper frame 23 guidean adjustable, barrel-sehydraulic plunger and barrel testing machine.curing yoke 28, which rigidly bears against the Another object is toprovide a hydraulic plunglower end of the barrel 2| clamping the barreler and barrel testing machine to test the con- 2| between thisadjustable, barrel-securing yoke dition of the lapped fit of a hydraulicplunger 28 and the upper frame 23 by means of threaded and barrel bymeasuring the amount of pressure 2'. nuts 20. A hole 30 drilled in theadjustable, bardrop caused by leakage of fluid under pressurerel-securing yoke 28 allows the plunger 3! to fit past the lapped fit.therethrough. Thrust bearing 32, having -a Another object is to provide:a hydraulic p1ungt readed spindle 33 and a handle 34, forces the er andbarrel testing machine by the use of a pl n r 3| into the barrel 2|. Thethreaded controlled hydraulic cushion effect resulting'us spindle 33 isin threaded engagement with a from the use of a high-pressure-fluidstorage tank threaded hole in the lower frame 35 of the holdand athree-way rotary valve. ing and. positioning fixture l3. Forming thesides Another object of this invention is to provide of the holding andpositioning fixture [3 are a hydraulic .plunger and barrel testingmachine channel-shaped members 36, which are bolted to adaptable for awide range of plunger and 'ba 30 the upper frame 23 and lower frame 35by means.

rel sizes, types and fits. of bolts 31. A drip pan 38 catches theleakage Further objects and advantages of this inven of fluid from theplun 3| d a rel tion as well as its construction, arrangement and In hep at f t apparatus a u ic operation will be apparent from the followingdep u er 3| a d barrel 2| having Standard p scription and claims inconnection with the ac- 35 ing characteristics are clamped firmly in thecompanying drawing, in which: holding and positioning fixture 13. Theadjust- The figure is a schematic arrangement of the ablebarrel-securing device 28 bears against the testing apparatus embodyingthis invention, lower end of the barrel 2| by means of threaded Thetesting machine consists essentially of a studs 21 and nuts 29 in such amanner as to high-pressure-fluid pump H, a high-pressure- 40 p n any lakage of fluid under hi h p re fluid storage tank I2, and a plunger andbarrel at t e gasketed surface 26. The plunger 3| by holding andpositioning fixture l3. means of thrust bearing 32 and threaded spindleThe high-pressure-flujd pump II 1' capabl of 33 is located in the barrel2| in any known .DOSigenerating a maximum pressure of 10,000 pounds tionthat a ow t ir apped surfaces to seal 0 f per square inch. Suitablyconnected to the fluid the fl under p e pplied at the askete'd pump IIis a fluid-reservoir tank 14. A check Bndof the barrelZl. valve 15installed on the forward end of the pump e -Way t ry v lve I9 is closedso as H prevents t fluid fro leaking back t .the to isolate thehigh-pressure-fiuid storage tank l2 pump end of the system. By means ofsuitable fr e ubi l8 and 2 connecting the hi hfittings a .pressure gauge['6 is connected to the pressure pump H with t e p r a barrel 3 checkvalve l 5 and a cutoff valve [1 is set between and 2 I. Using the pu p 1I the system is c a d the check valve I5 and pressure gauge I 6. with aselected pressure, which is read on the A length of high-pressure tubing18 connects Pressure gauge [6. The pump H is then isolated thehigh-pressure-fiuid pump II to a three-way from the system by means ofthe rotary valve l9 rotary valve l9, which is connected to the highandthe decrease in pressure is read on the pressure gauge 22 at regulartime intervals. By this means of isolating the pump end of the systemthe fluid is prevented from leaking thru the check valve 15 due to afaulty seating caused by dirt or other foreign matter; thus, all leakageoccurs between the lapped surfaces of the hydraulic plunger 3|" andbarrel 2|. If the rate of fall of the pressure is too rapid for ease ofaccurate ob.- servation, the high-pressurefluid storage tank I2 isplaced in the system by meansof therotary' valve l9. Using the pump H,the oil-storage tank I2 is charged with a selectedpressure. By means ofthe rotary valve t9 the pump ll is isolated from the system and theportion of the system from the fluid storage tank" l2 to the plunger 3|and barrel 2| is opened. The decrease in the pressure is again read onthe pressure gauge 22 at regular time intervals and recorded;

In this manner, the machine is calibratedfor any one type of plunger andbarrel.

This calibration, consists of the following constantsettings andvalues;the? position of plunger ill in. barrel 2|; the: position; of thethree-way rotary valve k9,, thev initial and flnal pressures read ongauges l6 andv 22, and the time required:

for-thepressure to fall from; the initial to the finalivalue.

To test a specimen plunger and barrel, 2. test is appliedinthesamexmanner as described aboveand the constants thus determinedcomparedwith those previously determined for'a standard plunger: and.barrel of the same type It is to be understood that variousmodifications and changes canbe made in this invention,

without departing from. the spirit and scope including a stationaryframe, means for clamping the barrel in said frame with the plungerextending in exposed position, and a movable clamp for engaging theplunger and positioning the plunger in selected position relative to thebarrel; a fluid conduit for connecting said pump and said holdingfixture for supplying high-pressure fluid to the barrel; a pressuregauge connected to said conduit adjacent said pump; a second pressuregauge connected to said conduit adjacent said holding fixture; a storagetank having a large fluid volume relative to the fluid volume of theremainder of the device; and means for selectively connecting anddisconnecting said tank with respect to said conduit between saidpressure. gauges.

2. A device for testing with fluid under high pressure a plunger andbarrel, said device comprising a high-pressure pump; a holding fixtureincluding a stationary frame, means for clamping the barrel in saidframe with the plunger extending in'exposed position, and a movableclamp for engaging the plunger and positioning the plunger. in selectedposition relative to the barrel; a fluid conduit for connecting saidpump and said holding fixture for supplying high-pressure fluid to thebarrel; a pressure gauge connected to said conduit; a storage tankhaving a large fluid volume relative to thefluidvolume of the remainderof the device; and means for selectively connect ing and disconnectingsaid tank with respect to said conduit.

THEODORE H. DWYER. WILLIAM H. DILDINE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 983,962 Werner Feb 14, 19111,706,567 Dezendorf Mar. 26, 1929 2,222,079 Larson Nov. 19, 19402,323,556 Mattocks July 6, 1943'

